We investigate qubit-qubit entanglement mediated by plasmons supported one-dimensional waveguides. explore both the situation of spontaneous formation from an unentangled state and emergence driven steady-state under continuous pumping. In cases, we show that large values for concurrence are attainable distances larger than operating wavelength using plasmonic waveguides currently available.

We show that a single rectangular hole in metallic film exhibits transmission resonances appear near the cutoff wavelength of waveguide. For light polarized with electric field pointing along hole's short axis, it is shown normalized-to-area transmittance at resonance proportional to ratio between long and sides, dielectric constant inside hole. Importantly, this resonant process accompanied by huge enhancement both entrance exit interfaces

We study theoretically electromagnetic modes guided by metallic wedges at telecom wavelengths. These are found to exhibit superior confinement while showing similar propagation loss as compared other subwavelength guiding configurations. It is also shown that mode focusing can be realized gradual modification of the wedge geometry along direction.

We demonstrate that textured closed surfaces, i.e., particles made of perfect electric conductors (PECs), are able to support localized electromagnetic resonances with properties resembling those surface plasmons (LSPs) in the optical regime. Because their similar behavior, we name these types as spoof LSPs. As a way example, show existence LSPs periodically PEC cylinders and almost analogy plasmonics. also present metamaterial approach captures basic ingredients response.

We show how both the subwavelength confinement associated with surface plasmons and one-dimensional character of plasmonic waveguides can be exploited to enhance coupling between quantum emitters. Resonance energy transfer phenomenon superradiance are investigated in three different waveguiding schemes (wires, wedges, channels) by means Finite Element Method. also develop a simplified model that is able capture main features numerical results.

Surface modes are generally believed to be an undesirable feature of finite photonic crystals (PC), unlike point or line defect modes. However, it is possible make the surface mode radiate by appropriate corrugation PC interface. In this paper we show theoretically that coherent action these indentations can engineered collimate within a few degrees light exiting waveguide, funnel coming from free space into waveguide.

A new approach for the spatial and temporal modulation of electromagnetic fields at terahertz frequencies is presented. The waveguiding elements are based on plasmonic metamaterial notions consist an easy-to-manufacture periodic chain metallic box-shaped protruding out a surface. It shown that dispersion relation corresponding modes rather insensitive to waveguide width, preserving tight confinement reasonable absorption loss even when transverse dimensions well in subwavelength regime. This...

We theoretically study channel plasmon-polaritons (CPPs) with a geometry similar to that in recent experiments at telecom wavelengths (Bozhevolnyi et al., Nature 440, 508 (2006)). The CPP modal shape, dispersion relation, and losses are simulated using the multiple multipole method finite difference time domain technique. It is shown that, increase of wavelength, fundamental mode shifts progressively towards groove opening, ceasing be guided bottom becoming hybridized wedge running along edges.

We study the generation of entanglement between two distant qubits mediated by surface plasmons a metallic waveguide. show that V-shaped channel milled in flat is much more efficient for this purpose than cylinder. The role misalignments dipole moments qubits, an aspect great importance experimental implementations, also studied. A careful analysis quantum dynamics system means master equation shows two-qubit essentially due to dissipative part effective qubit-qubit coupling provided...

We report on subwavelength plasmon-polariton guiding by triangular metal wedges at telecom wavelengths. A high-quality fabrication procedure for making gold wedge waveguides, which is also mass-production compatible offering large-scale parallel of plasmonic components, developed. Using scanning near-field optical imaging the wavelengths in range 1.43-1.52 microm, we demonstrate low-loss (propagation length approximately 120 microm) and well-confined (mode width congruent with 1.3 along...

Efficient light-matter interaction lies at the heart of many emerging technologies that seek on-chip integration solid-state photonic systems. Plasmonic waveguides, which guide radiation in form strongly confined surface plasmon-polariton modes, represent a promising solution to manipulate single photons coplanar architectures with unprecedented small footprints. Here we demonstrate coupling emission from quantum emitter channel plasmon polaritons supported by V-groove plasmonic waveguide....

Surface plasmons, electromagnetic fields generated by the charge oscillations at surface of a light-illuminated metallic nanoparticle, are typically described in terms effective electric dipoles and their dynamics. Scientists discover that adding periodic grooves to subwavelength disks creates localized plasmons magnetic character addition typical ones.

We demonstrate the possibility of designing efficient, nonreciprocal few-photon devices by exploiting chiral coupling between two waveguide modes and a single quantum emitter. show how this system can photon transport at single-photon level routing mechanism. Afterwards, we also fundamentally different two-photon response makes transistorlike behavior, where first open transmission channel for second incoming photon. The efficiency in both cases is shown to be large feasible experimental...

We report on experimental evidences of the preservation energy-time entanglement for extraordinary plasmonic light transmission through sub-wavelength metallic hole arrays, and long range surface plasmon polaritons. Plasmons are shown to coherently exist at two different times separated by much more than plasmons lifetime. This kind involving matter is expected be useful future processing storing quantum information.

A theory is presented to describe the optical transmission through a rectangular hole in real metal film. The previous of perfect electric conductor extended include effects associated with having by adding surface-impedance boundary conditions and an effective index mode calculation. Both peak amplitude Fabry-P\'erot resonance fundamental agree quantitatively experiments. Finite-difference time-domain calculations are used verify theoretical findings as well show including loss, which not...

Highly accurate computations of surface plasmons in metallic nanostructures with various geometries are presented. Calculations for cylinders irregular cross section, coupled structures, and periodic gratings shown. These systems exhibit a resonant behavior complex field distribution strong enhancement, therefore their computation requires very numerical method. It is shown that the multiple multipole (MMP) method, together an automatic setting (AMS) procedure, well suited these...

We propose a metamaterial approach to route terahertz waves that features subwavelength confinement in the transverse plane. The guiding mechanism is based on geometrically induced electromagnetic modes sustained by corrugated metallic wedges, whose characteristics resemble those of wedge plasmon polaritons at telecom and optical frequencies. Additionally, frequency selective focusing slowing down radiation proposed waveguides are presented.

We propose a feasible way of guiding terahertz waves along V grooves whose lateral dimensions are subwavelength. A plasmonic metamaterial is built by periodically corrugating these channels in such that the system supports propagation electromagnetic modes with characteristics mimicking those channel plasmon polaritons optical regime. These geometrically induced guided present long lengths and low bending losses, making them excellent candidates for routing at planar surfaces.

Exciton harvesting is demonstrated in an ensemble of quantum emitters coupled to localized surface plasmons. When the interaction between and dipole mode a metallic nanosphere reaches strong coupling regime, exciton conductance greatly increased. The spatial map matches plasmon field intensity profile, which indicates that transport properties can be tuned by adequately tailoring plasmonic resonance. Under coupling, we find pure dephasing have detrimental or beneficial effects on...

We study the spontaneous entanglement generation between two qubits chirally coupled to a waveguide. The maximum achievable concurrence is demonstrated increase by factor of $4/e\ensuremath{\sim}1.5$ as compared non-chiral coupling situation. proposed scheme shown be robust against variation qubit properties such detuning and separation, which are critical in nonchiral case. This result relaxes restrictive requirements situation, paving way toward realistic implementation. Our results...

We study the possibility of using guided photons to generate, control, and measure entanglement two qubits that is mediated by a one-dimensional waveguide. show how can be generated both with single-photon two-photon wave packets. The introduction second photon allows for manipulation between qubits, phenomena such as sudden death revival appear. Finally, we propose procedure detection via scattering output single over qubit state.

When a collection of quantum emitters interacts with an electromagnetic field, the whole system can enter into collective strong coupling regime in which hybrid light-matter states, i.e., polaritons be created. Only small portion excitations are coupled to light and there many dark states that, principle, retain their pure excitonic nature. Here we theoretically demonstrate that these have delocalized character, is inherent polaritons, despite fact they do not photonic component. This...

A method for the computation of band structure two-dimensional photonic crystals is presented. It well suited including materials with arbitrary frequency-dependent dielectric constants. The technique can be applied to study irregularly shaped (noncircular) elements. This based on multiple multipole method. In order find solutions nonlinear eigenvalue problem, a multipolar source introduced which acts as an excitation. By varying frequency source, various eigenmodes are excited and localized...

We present a new type of waveguide scheme for terahertz circuitry based on the concept spoof surface plasmons. This structure is composed one-dimensional array L-shaped metallic elements horizontally attached to metal surface. The dispersion relation electromagnetic modes supported by this system presents very weak dependence with lateral dimension and are deep-subwavelength confined long-enough propagation length.